Cose layout not working properly

I recently upgraded from 2.5.1 to 2.7.10 and I’m now running into two issues that previously weren’t there with the cose layout.

• Specifying the cose layout in the initialization options seems to break the layout completely.
  • See this fiddle: http://jsbin.com/qeyozivipo/edit?js,output
• Adding nodes to the graph and calling cy.layout({name:'cose'}); also does not apply the layout properly, I am getting overlapping nodes.
  • Here is a fiddle for this one: http://jsbin.com/sevefoyatu/1/edit?js,output

[maxkfranz]

Force-directed / physics simulation layouts generally need unique initial positions to work properly, or you get invalid forces (0 distance) and all the nodes don’t move. You need to either specify nodes with initial positions or tell the layout to set some for you with randomize: true: http://jsbin.com/pekotesuno/2/edit?js,output

Same for your second case: http://jsbin.com/gukeqiyuqe/1/edit?js,output

[maxkfranz]

See also https://github.com/cytoscape/cytoscape.js/issues/1520 which should automatically mitigate this issue for CoSE